Sort the statements based on whether they are correct or incorrect. all waves have the same wavelength. radio telescopes give us information about the birthplace of a star. if the wavelength of a wave increases, its frequency also increases. visible light is a kind of electromagnetic wave. all objects emit electromagnetic waves.

All waves have the same wavelength.

FALSE

All waves may  not be of same frequency because all waves are of different energy levels and energy depends on the frequency which is different.

Radio telescopes give us information about the birthplace of a star.

FALSE

Radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources.

If the wavelength of a wave increases, its frequency also increases.

FALSE

relation between frequency and wavelength is given as

so they are inversely related to each other and hence if wavelength is increased then frequency must have to decrease.

Visible light is a kind of electromagnetic wave.

TRUE

All visible light is a part of electromagnetic waves.

All objects emit electromagnetic waves.

TRUE

Due to thermal vibrations all objects radiate electromagnetic waves of different frequencies.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.